Gupta, V. (2009). Vocabulary and Comprehension Skills. Penguin Books.
芝加哥风格引文Gupta, Vaishali. Vocabulary and Comprehension Skills. USA: Penguin Books, 2009.
MLA引文Gupta, Vaishali. Vocabulary and Comprehension Skills. Penguin Books, 2009.
警告：这些引文格式不一定是100％准确.